Page 202 - Mechanics Analysis Composite Materials

Chapter 4. Mechanics of a composite layer 187

0 15 30 45 60 75 90
Fig. 4.57. Dependencies of the moduli of a carbon-epoxy layer on the orientation angle: -
orthotropic angle-ply &q5 layer; - - - - anisotropic +$ layer: o experiment for an angle-ply layer.

Fig. 4.58. Deformation and stresses induced in individual plies (a) and bonded symmetric plies (b) by
uniaxial tension.
6,. = 0 we can simulate the stress-strain state of the ply in the *$ angle-ply layer
putting yr? = 0. Then, the third equation yields

Superscript ' + ' indicates that elastic constants correspond to an individual +d, ply.
Substituting this shear stress into the first equation of Eqs. (4.75) we arrive at
6, = E,E.~, where

(4.131)

is the modulus of the k$ angle-ply layer.